deactivate multicast_mode by default

package/gluon-mesh-batman-adv-core/files/lib/gluon/upgrade/mesh-batman-adv-core/invariant/011-mesh

@@ -10,6 +10,7 @@ uci:section('batman-adv', 'mesh', 'bat0',
 	    {
 		    orig_interval = 5000,
 		    gw_mode = 'client',
+		    multicast_mode = 0,
 	    }
 )
 uci:save('batman-adv')